Distributed optical fiber temperature measurement system suitable for tunnel temperature measurement and temperature measurement method thereof

Abstract

The invention provides a distributed optical fiber temperature measurement system suitable for tunnel temperature measurement and a temperature measurement method thereof. The system comprises the distributed optical fiber temperature measurement system, a sensing optical fiber and an upper computer. The distributed optical fiber temperature measurement system comprises a control panel, a pulse semiconductor laser PLD, a wavelength division multiplexing component, a calibration optical fiber, a photoelectric detector APD, a signal amplifier and an acquisition board. The sensing optical fiber comprises an optical fiber jumper (1) and an armored multi-mode optical fiber (2). The advantages are that the distributed optical fiber temperature measurement system is introduced in tunnel detection in engineering so that the disadvantages of discontinuous, inaccurate and unreliable conventional measurement can be overcome. The performed measurement is continuous measurement along an optical fiber path so that the continuous monitoring data of the tunnel can be acquired, the means of tunnel detection can be improved by the technology, a large number of new parameters related to diseases can be provided and the long-term safety of the tunnel can be powerfully guaranteed.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a distributed optical fiber temperature measurement system and a temperature measurement method suitable for tunnel temperature measurement. Background technique [0002] Fire is one of the high hazards faced by road tunnels. In 1999, the Mont Blanc Tunnel in France, the Kitz Steinhorn Tunnel in Salzburg, Austria in 2000, and the Xi’an Metro Tunnel in 2009 caused a large number of casualties, all of which sounded a blow to the fire safety of tunnels in our country. alarm bell. [0003] Most of the fires in tunnels are open fires with dense smoke, and their thermal radiation rate is several megawatts, which can form a fire within a few minutes. Tests of the "tunnel fire" example showed that after about 5 minutes, the temperature of the vehicle fire rose to about 200°C. Existing research results have shown that: when a serious fire occurs in a tunnel, w...

AI Technical Summary

Problems solved by technology

This network of sensors is similar to traditional sensor networks, often due to resolution, bandwidth or space, the number of sensors or network structure is limited, so the accuracy, speed and range of temperature measurement are also limited.

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